Neil,
If your hinge is otherwise in good shape, you could just weld a pin where the original is broken off. My '37 and '42 have the same type of attachment and both have required repair, either in the front or rear.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix